SOURCEFORGE » RALF » 2015 Simplified communications schemes of Voyager I probe

h1. Our coding solution

*Cascade coding simulation* 

In this section, we will simulate cascade coding: convolution coding plus RS coding, the communication chain is shown as following:

!Communication_chain_cascade.jpg!

Block diagram of cascade encode and decode

The cascade coding above insert a interleave module in order to improve the coding gain for burst errors. The convolution encoding rate is 2/3, and punched from CC(2,1,7;133,171). The convolution decoding uses soft decoding, so the total code rate is 0.614.

We just use the same simulate block diagram but change the encoding and decoding module as the figure above shows. Then we get the BER data:

BER results of BPSK simulation with cascade coding

!BPSK_simulation_cascade_results.jpg!